Printing cylinder of rotary duplicating machines



Jan 1936- s; T. MORRELL ET AL 9 PRINTING CYLINDER OF ROTARY DUPLICATING MACHINES Filed S ept. 25, 1954 2 Sheets-Sheet 1 1 u I I n A ,6. T77702-r//5 N VEN 7-085 Jan, 7, 1936.

I S. T. MORRELL El AL PRINTING CYLINDER OF ROTARY DUPLICATING MACHINES Sept. 25, 1934 2 Sheets$heet 2 Patented Jan. 7, 1936 PATENT OFFICE PRINTING CYLINDER OF ROTARY DUPLI- CATING MACHINES Samuel Tankard Morrell and Horace George St. Vincent Beechey, Auckland, New Zealand Application September 25, 1934, Serial No. 745,464 In New Zealand March 1'7, 1934 4 Claims.

The invention relates to machines used for duplicating printing, and has for its object the provision of improvements in that type of machine having a rotary printing cylinder, the improvements being designed to enable printing to be carried out either in one, or two or more colours, by means of a single cylinder, in one and the same printing operation.

Printing cylinders of machines of the beforementioned class have a part periphery consisting of a perforated plate, to the interior of which ink is supplied to pass through a pad secured over the diaphragm, for the purpose of supplying ink to a stencil made to cover the pad, said stencil constituting the printing surface.

The main improvement put forward by the invention consists in providing in the diaphragm, the ink pad and the stencil, registering ink confining areas, whereby ink supplied to a particular area of the diaphragm is localized or confined to the corresponding or radially opposite area of the stencil, thereby enabling inks of different colours to be used simultaneously without running into each other, and a single stencil to be used to produce in one and the same printing operation, printed matter containing differently coloured areas.

A further improvement consists in making the perforated diaphragm detachable from the cylinder ends, to facilitate the changing of diaphragms, the inking of the latter and the cleaning of same when necessary.

Other improvements are also comprised in the invention, which however, will be further described with the aid of the accompanying drawings wherein:-

Figure 1 is a part side elevation of a rotary duplicating machine with the improved cylinder fitted thereon,

Figure 2 a further part side elevation showing the diaphragm partly removed from the cylinder ends to facilitate inking,

Figure 3 a sectional elevation and Figure 4, a plan view of the printing cylinder,

Figure 5 a detail view comprising an enlarged part sectional elevation of the printing cylinder,

Figure 6 a plan view of a sheet from which a stencil is cut for use on the printing cylinder,

Figure 7 a detail view (enlarged) in sectional elevation, showing a perforated tray fitted in a compartment of the diaphragm and,

Figure 8 a detail view of one of the securing hooks used on the cylinder ends.

In the drawings, I represents a rotary duplicating machine provided with a rotary printing drum mounted and geared for operation from the crank handle 2 in any approved manner.

The printing drum comprises circular end plates 3 held together by tie bolts 4, and supported by the shaft 5 so as to be rotated through the gear- 5 ing from said crank handle 2.

The perforated or foraminous diaphragm 6 of the drum is secured to a segmental openwork frame 1 formed for accommodation between the end plates 3 and shaped to follow the edges 10 thereof, the side members of said frame 1 being provided with outwardly extending headed studs 8 adapted to take into slots 9 in said end plates 3.

Hooks l0 pivoted on the end plates 3 are provided for engaging behind the heads of the studs 8 outside said plates, for the purpose of locking the frame I to the latter, sliding keepers Illa on the hooks l8 enabling the hooks in to in turn be locked on the studs 8.

By disengaging opposed hooks in from their respective studs 8, the frame I with the perforated diaphragm 6 attached, is enabled to be partly detached from the end plates 3 so that it can be, swung over to the position shewn in Figure 2 to enable ink to be placed in the interior of the diaphragm, the slots 9 into which the unlocked studs 8 take being shaped to permit the frame to swing on the locked studs 8.

The means illustrated for attaching the frame F and diaphragm 6 to the end plates 3, are found suitable for the purpose, but any other suitable means may be employed according to the make of machine to which the invention is applied.

The frame 7 is provided with the usual studs l I 5 and spring clip !2 for securing the stencil M on the diaphragm 6, but here again said securing means are not limited to those illustrated, while the ink pad I3 can be secured to the frame in any known way.

If desired, the frame I and diaphragm 6 can be completely removed from the end plates 3 for replacement by another frame 1 and diaphragm 6 or for cleaning purposes.

In order to localize or confine ink to a particular area of the stencil M, the frame I which is located inside the diaphragm 6, is divided by partitions I5 into compartments I6, said partitions being attached by soldering or otherwise along their edges to the diaphragm 6 to prevent the passage of ink between the latter and the partitions.

The stencil sheets M for use on the printing cylinder are produced with lines Ma thereon, corresponding exactly to the partitions l5 of the frame 1, and the stencil openings cut in the-sheet 14 as are confined to one or more spaces bounded by said lines [4a or by the latter and the boundaries of the printing area of the stencil sheet.

When it is desired to produce printed work having portions in different colours, the ink pad I3 is gummed on its surface presented to the diaphragm 6 along lines which follow or register with partitions l5, so as to surround an area on the diaphragm 6, with which will register the area of the stencil l4 containing the matter to be printed in a selected colour.

The pad l3, after being gummed as described, is applied to the diaphragm 6, following which the stencil sheet I4 is gummed along similar lines and applied to the ink pad I3, with the result that there is provided on the printing drum a diaphragm 6, an ink pad i3 and a stencil sheet l4, having radially registering areas within which ink supplied to the interior of the diaphragm 6 per one of the compartments H5 in the frame I, is confined or localized by partitions I5 in the frame 1, and the gummed lines between the diaphragm 6 and the ink pad l3, and between the latter and the stencil l4.

Following the securing of the pad 13 and stencil I4 together and to the diaphragm 6 along the boundary of a selected area, ink is enabled to pass radially through the area from the compartment 56 in register therewith, but cannot pass beyond the boundary of said area.

It will be obvious that any number of separate areas or ink confining or localizing areas can be provided for, within the capacity of the subdivided frame I as also will it be obvious that frames 1 containing varying numbers of compartments l6 of varying sizes and shapes and each with a diaphragm 6 attached, can be provided for substitution one for another, to enable desired effects to be obtained.

In order to facilitate the changing of the ink in any compartment l6 of the frame I by avoiding the necessity of cleaning the compartment prior to using ink of another colour, each compartment Hi can be fitted with a detachable tray El made to neatly fit the compartment, the bottom of the tray l7 containing perforations 18 which register with the perforations in the diaphragm E; forming the bottom of the compartment, the perforations i8 preferably being surrounded by slight bosses or burrs liia adapted to enter theperforations in the diaphragm 6 to ensure registration of the perforations.

When trays i! are used in the compartments IS, the latter never become inked or dirty and changes of ink can be made with ease and rapidity simply by removing the inked trays l1, inserting clean trays and fitting a new pad l3, for use with further ink or inks of the desired colour or colours. 7

In cases where an ink confining or localizin area extends over two or more compartments l6 of the diaphragm 6, ink placed in one or more of said compartments will readily pass through the pad 13 to the remaining compartments within the area, by the law of capillary attraction.

What we do claim and desire to obtain by Letters Patent of the United States of America is:-

1. In a duplicating machine, a, rotary cylinder. a segmental openwork frame displaceably mounted in the rotary cylinder and including ribs radial to the axis of the cylinder, a foraminous diaphragm attached to the outer face of the frame in complementary relation to the periphery of the cylinder, said ribs forming separated inking compartments on the inner surface of the foraminous diaphragm and with the compartments open on their inner sides, a pad displaceable on the outer face of the diaphragm, and a stencil imposed on the pad.

2. In a duplicating machine, a rotary cylinder, a segmental openwork frame displaceably mounted on the rotary cylinder and including intersecting ribs radial to the axis of the cylinder, a foraminous diaphragm attached to the outer face of the frame in complementary relation to the periphery of the cylinder, said ribs forming separated inking compartments on the inner surface of the foraminous diaphragm and with the compartments open on their inner sides, a pad displaceable on the outer face of the diaphragm, and a stencil imposed. on the pad, said stencil having lines indicated thereon to register with the intersecting ribs of the segmental frame.

3. In a duplicating machine, a rotary cylinder, a segmental or: nwork frame displaceably mounted in the rotary cylinder and including intersecting ribs radial to the axis of the cylinder, a foraminous diaphragm attached to the outer face of the frame in complementary relation to the periphery of the cylinder, said ribs forming separated inking compartments on the inner surface of the foraminous diaphragm and with the compartments open on their inner sides, a pad on the outer face of the diaphragm and secured thereto by lines of gum registering with the intersecting ribs of the segmental frame, and a stencil imposed on the pad and secured thereto by lines of gum coincident with the lines of gum securing the pad to the intersecting ribs of the segmental frame, the parts gummed together serving to prevent flow of ink from one compartment to an adjacent compartment.

4. In a duplicating machine, a rotary cylinder,

a segmental openwork frame displaceably mountedin the rotary cylinder and including intersecting ribs radial to the axis of the cylinder, a foraminous diaphragm attached to the outer face of the frame in complementary relation to the periphery of the cylinder, said ribs forming separated compartments on the inner surface of the foraminous diaphragm .and with the compartments open on displaceably 

